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Equity - Exchangeable Shares and Series F and Series G Preferred Stock (Detail) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 06, 2017 shares | Jun. 30, 2018 shares | Jun. 30, 2017 shares | Jun. 30, 2018 Acquisition shares | Jun. 30, 2017 shares | Dec. 31, 2017 shares | Oct. 05, 2017 shares
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares of Common stock received for each exchangeable share (in shares) |  |  |  | 1 |  |  |
Minimum number of shares that can be exchanged by exchangeable shareholders unless the number of remaining exchangeable shares registered in the name of the holder is less (in shares) |  |  |  | 50,000 |  |  |
Number of business acquisitions having issuances of preferred stock | Acquisition |  |  |  | 2 |  |  |
Common stock, shares outstanding (in shares) |  | 149,088,134 |  | 149,088,134 |  | 153,342,326 |
Series F Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  | 1
Preferred stock, shares retired (in shares) | 1 |  |  |  |  |  |
Series G Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  | 1 |  | 1 |  | 1 |
Preferred stock, shares outstanding (in shares) |  | 1 |  | 1 |  | 1 |
Exchangeable Shares For Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Exchangeable shares exchanged for common stock (in shares) |  | 0 | 0 | 0 | 2,500,000 |  |
Exchangeable Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  | 486,112 |  | 486,112 |  | 486,112 |
Exchangeable Shares Associated with Series G Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  | 400,000 |  | 400,000 |  |  |

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